feat: 任务树/流转卡展示驳回原因与返工备注(网页SlimCard,移动端FlowCard/SwipeCards)

frontend/src/components/TaskTree/TaskFlowView.tsx

@@ -146,6 +146,13 @@ const SlimCard = memo(function SlimCard({
         ⏰ {fmtTime(task.created_at)}
         {task.completed_at ? ` → ${fmtTime(task.completed_at)}` : " → 至今"}
       </p>
+      {/* 驳回/返工原因：原 REJECTED 取 reject_reason；返工节点取含“驳回/返工”的备注 */}
+      {(() => {
+        const rj = task.reject_reason;
+        const rm = task.remark;
+        const txt = rj ? `❌ 驳回: ${rj}` : (rm && /驳回|返工/.test(rm) ? rm : null);
+        return txt ? <p className={`${sz.sub} text-red-500 whitespace-pre-wrap`}>{txt}</p> : null;
+      })()}
       {legacy && <p className={`${sz.sub} text-orange-500`}>源自: {assigneeName || (findParent(task)?.assignee_id) || "历史任务"}</p>}
       {isNestedSpawn && <p className={`${sz.sub} text-purple-500`}>协助: {findParent(task)?.assignee_id || "—"}</p>}
       {/* 操作按钮 */}